all good except #8
8.
it asked for the actual solutions.
x^2 - (-x^2 - 6)^2 = 36
x^2 - (x^4 + 12x^2 + 36) = 36
x^2 - x^4 - 12x^2 - 36 = 36
x^4 + 11x^2 + 72 = 0
no real roots, the discriminant is negative.
http://www.wolframalpha.com/input/?i=plot+x%5E2+-+(y+-+6)%5E2+%3D+36+,+y+%3D+-x%5E2
Can someone check my answers?
1. Convert 13pi/30 to degree measure.
78°
2. Find the distance between (4,4) and (8,7).
5
3. What is the vertex of the parabola y = (x + 8)^2 - 2?
(-8,-2)
4. The graph of y = 6(x - 8)^2 + 1 open downward.
False.
5. An angle that measures pi radians equals 360°.
False.
6. What is the center of the graph of 6(x + 9)^2 + 4(y - 2)^2 = 36?
(-9,2)
7. Find the four corners of the fundamental rectangle of the hyperbola: x^2/81 - y^2/36 = 1.
(±9,±6)
8. Find the exact solutions of x^2 - (y - 6)^2 = 36 and y = -x^2.
-x^4 - 11x^2 - 36?
9. If sin B = 5√2/5√3, find the value of csc B.
√6/2
10. Which value is greater: sin 60° or cos 30°?
They are equal.
Thanks in advance
(I reposted this in case no one saw my question)
1 answer
1 answer